Patent EA-003583-B1 (EA)
Title: Method of protection from aging of glycol ether
Inventor: FORSTER RUEDIGER
IPC: C07C41/46
Filed: 1999-06-01
Abstract: 1. Method of protection from aging of glycol or glycol ether, circulating in gaze-drying device, by administering of thermo-resistant addition, the addition containing an organic phosphonate or phosphorous acid ester, - wherein the temperature in gaze-drying device is increasing up to, nearly, 220 degree C when the oxygen is significally excluded, - wherein the addition is given in such quantity that the portion of organic phosphonate or phosphorous acid ester is in range of from 0.01 to 0.1weight %, preferably between 0.02 and 0.05 weight %. 2. Method of protection from aging of glycol or glycol ether, circulating in gaze-drying device according to claim 1, characterized in that a phosphonate is hydroxyphosphoncarbonic acid, preferably, hydroxyphosphoncarbonic acid with the following structure wherein n =0......8. 3. Method of protection from aging of glycol or glycol ether, circulating in gaze-drying device according to claim 1, characterized in that the addition contains - glycerin ester with, at least, one linear carbonic acid, containing sterically hindered hydroxyphenyl group, - hydroxyphosphoncarbonic acid. 4. Method of protection from aging of glycol or glycol ether, circulating in gaze-drying device according to claim 3, characterized in that the ester is partially mixed glycerin ester with, - at least, one linear carbonic acid, containing sterically hindered hydroxyphenyl group with quantity of carbon atoms of from 8 to 18 in chain and with - at least one more linear carbonic acid. 5. Method of protection from aging of glycol or glycol ether, circulating in gaze-drying device according to claim 4, characterized in that the addition contains - at least 70 weight % of triethylene glycol, - partially mixed glycerin ester in quantity of from 0.01 to 2 weight %, preferably 0.1-0.5 weight %, - and hydrophosphoncarbonic acid in quantity of from 1 to 5 weight %, preferably 2-5 weight %. 6. Method of protection from aging of glycol or glycol ether, circulating in gaze-drying device according to claim 1, characterized in that the addition contains - a compound, containing sterically hindered hydroxyphenyl group, - hydroxyphosphoncarbonic acid, - amino aromatic antioxidant. 7. Method of protection from aging of glycol or glycol ether, circulating in gaze-drying device according to claim 6, characterized in that the compound containing sterically hindered hydroxyphenyl group and hydroxyphosphoncarbonic acid are mutually bonded. 8. Method of protection from aging of glycol or glycol ether, circulating in gaze-drying device according to claim 6, characterized in that the compound containing sterically hindered hydroxyphenyl group, is glycerin ester with, at least, one linear carbonic acid, containing sterically hindered hydroxyphenyl group, wherein hydroxyphenyl group is bonded in para-position with carbonic acid, etherized by glycerin. 9. Method of protection from aging of glycol or glycol ether, circulating in gaze-drying device according to claim 6 or 8, characterized in that hydroxyphosphoncarbonic acid has a structure wherein n =0......8. 10. Method of protection from aging of glycol or glycol ether, circulating in gaze-drying device according to claim 6, characterized in that the addition contains - at least 70 weight % of triethylene glycol, - compound containing sterically hindered hydroxyphenyl group in quantity of from 0.01 to 2 weight %, preferably 0.1-0.5 weight %, - and hydrophosphoncarbonic acid in quantity of from 1 to 5 weight %, preferably 2-5 weight %. - Amino aromatic antioxidant. 11. Method of protection from aging of glycol or glycol ether, circulating in gaze-drying device according to claim 10, characterized in that the addition contains polycarbonic acid in quantity of from 1 to 10 weight %preferably from 2.5 to 5 weight %. 12. Method of protection from aging of glycol or glycol ether, circulating in gaze-drying device according to claim 1, characterized in that the addition contains - hydrophosphoncarbonic acid and - tertiary alkanoilamin. 13. Method of protection from aging of glycol or glycol ether, circulating in gaze-drying device according to claim 12, characterized in that hydroxyphosphoncarbonic acid has a structure wherein n=0......8. 14. Method of protection from aging of glycol or glycol ether, circulating in gaze-drying device according to claim 12 or 13, characterized in that the tertiary alkanoilamin includes triethanolamine and/or methylethanolamin.